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' PRESS FOR PLASTIC MATERIAL. No. 304,387. Patented Sept. 2, 1884.

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Nr'rE STATES ATENT i EErcE.

SAMUEL MoGABTER, or NoERIsTowN, PENNSYLVANIA, AssIGNoE or ONE- THIRD TO JOHN D. NEwBoLD, or sAME rLAcE PRESS FOR PLASTIC MATERlAL.

SPECIFICATION forming part of Letters Patent No. 304,337, dated September 2. 1884.

Application filed January 14, 188

To all whom it may concern;

Be it known that l, SAMUEL McOARTER, a citizen of the United States, and a resident of Norristown, Montgomery county, Pennsylva- 5 nia, have invented certain Improvements in Presses for Plastic Material, of which the following is a specification.

The main object of my invention is to construct a powerful, compact, and effective ma- IO chine for pressing blocks of plastic material, the number of parts in the machine being few and the application of power direct. A further object is to prevent the straining of the machine by excessive pressure upon the mass I 5 confined in the mold.

In the accompanying drawings, Figure 1, Sheet 1, is a plan view of the press; Fig. 2, a longitudinal section of the same; Fig. 3, Sheet 2, and Figs. 4 and 5, Sheet 3, diagrams illus- 2o trating the operation of the press; Fig. 6, Sheet 4, a transverse section on the line 1 2, Fig. Fig. 7 Sheet 5, a sectional plan on the line 3 4, Fig. 2 and Fig. 8, a viewillustrating a modification of part of the invention.

The fixed frame of the machine comprises the base A, opposite sides, B B, top D, and' back E, the parts A, B, and E being cast in one piece or rigidly bolted together, but the top D being pivoted to the back E at the point 00, and being confined vertically to the side frames by means of bolts a, which pass through openings in the base, top, and sides, the upper ends of the bolts having nuts bearing on the top D, and the heads at the lower ends of said bolts bearing on a cross-bar, 1), between which and the base A are interposed springs (Z.

To bearings in the side frames, B B,are adapted two shafts, F and G, which are suitably 4ogeared together by spur-wheels e e,one of these shafts, preferably the shaft F, being intended to be driven by power applied in any suitable manner.

To guides on the base A and top D of the 4 5 fixed frame is adapted a frame, J, which is free to slide longitudinally in said guides, this frame J having an opening, f, forming a mold, in which is a snugly-fitting plunger, 9, the red h of the latter having a cross-head, I, verti- (No model.)

cally guided in the frame J, and having an inclined under face, 2'.

On the shaft F is an eccentric, K, and a cam, M, the eccentric having a block, If, with inclined upper face, i, adapted to act upon the inclined face 'i of the crossheadI, and the cam M being adapted to act upon a projection, l, of said cross-head, so as to impart to the plunger the differential vertical reciprocating movement described hereinafter, thereciprocation of the frame J being effected by a cam, N, on the shaft G, said cam acting on the rear of the frame J, and having a pin, a, adapted to act upon a pivoted arm, P, connected by a rod, 1), to the said frame.

The operation of the machine will be understood on reference to Figs. 2, 3, 4, and 5, which represent the different steps in the for- .mation of the block of plastic material. In

Fig. 2 the plunger 9 is at the bottom of the mold f, and the latter is in line with the opening s in the top D of the frame, said opening forming a continuation of the supply-hopper. (Shown by dotted lines.) The mold being filled'with the plastic material or compound, the frame J is moved by the action of the cam N, so as to bring the mold under the pressblock 10, forming part of the top frame, D, as shown in Fig. 3, the frame J being allowed to remain in this position while the plunger 9 is raised to compress the mass in the mold, this elevation of the plunger being effected by the action of the block 70 upon the cross-head I, as shown in Fig. 3. The block It, being under the control of the eccentric K, has both a vertical andlateral movement, and, owing to the inclined faces it" of the cross-head and block, the effect of this movement is to retain the plunger for a short time at the limit of its upward movement, and then to permit a slight retraction of the plunger, as shown in Fig. 4, so as to relieve the mass in the mold from pressure prior to the movement of the frame J by the cam N, so as to carry the mold from under the press-block w, the ejection of the contents of the mold being then effected as the plunger is elevated by the action of the cam M on the portion 1 of the cross-head I. (See Fig. 5.) The retraction of the frame J is cf fected by the action of the pin a on the arm P, and as soon as the mold is again brought under the opening 8 the plunger is permitted to descend, so that the mold is in condition to receive a fresh charge of plastic material prior to a repetition of the above-described opera t-ions. The amount of pressure tov which the mass in the mold is subjected cannot exceed that exerted upon the cross-bar Z) by the springs d, the top frame, D, of the press yielding as soon as the pressure thereupon exceeds the downward pressure of the springs, which is transmitted to said top frame through the medium of the bolts to. I

The pivoting of the top frame, D, is effected simply by means of a bar, m, adapted to segmental recesses in the said frame and in the back frame, F, as shown in Fig. 2, so that on removing the nuts from the upper ends of the bolts a the said frame D can be readily removed to permit access to the frame J and its mold.

A vibrating frame, J, may, if desired, be used in place of the reciprocating frame, as shown in Fig. 8, the camNin this case acting on anti-frictionrollers carried by arms on the frame J.

I claim as my invention 1. The combination of the fixed frame of the machine, having a feed-opening, s, and

press-block w, the sliding frame J, carrying the shaft F, having an eccentric, K, and the block 7c, carried by said eccentric and having an inclined face, i, adapted to act on the inclined face i of the cross-head, as set forth.

3. The combination of the mold, the plunger 9, having a cross-head, I, with inclined faced and projection I, the shaft F, having an eccentric, K, and cam M, and the block k, carried by said eccentric and having an inclined face, i, as set forth.

4. The combination of the fixed frame, having a feed-opening, s, and press-block w, the sliding frame J, having the mold and plunger, with guided cross-head I, the shaft F, with eccentric-block k, and cam M, for actuating the plunger, and the shaft G, with cam mechanism, substantially as described, for acting on the frame J, as set forth.

5. The combination of the frame J, having the mold and plunger, mechanism for operating said plunger, the fixed frame, having a pivoted top frame, D, with feed opening 8 and press-block w, and means, substantially as described, for confining said frame D with a yielding pressure, as set forth.

6. The combination of the top frame, D,and rear frame, E, each having a segmental recess,

with the bar :0, adapted to said recesses and serving to pivot the frames together, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL MoOAR-TER. Witnesses:

J. P. HALE JENKINS, F. L. MURPHY. 

